18287772 has 12 divisors (see below), whose sum is σ = 42671496. Its totient is φ = 6095920.

The previous prime is 18287749. The next prime is 18287779. The reversal of 18287772 is 27778281.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18287779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761979 + ... + 762002.

It is an arithmetic number, because the mean of its divisors is an integer number (3555958).

Almost surely, 2^18287772 is an apocalyptic number.

18287772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18287772 is an abundant number, since it is smaller than the sum of its proper divisors (24383724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18287772 is a wasteful number, since it uses less digits than its factorization.

18287772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523988 (or 1523986 counting only the distinct ones).

The product of its digits is 87808, while the sum is 42.

The square root of 18287772 is about 4276.4204657634. The cubic root of 18287772 is about 263.4633842833.

The spelling of 18287772 in words is "eighteen million, two hundred eighty-seven thousand, seven hundred seventy-two".